Quick-throw mechanism



' May 28, 1929.

P. s. IVANHOFF QUICK' THROW MECHANISM Filed June 22, 1927 ffffofwfyPatented May 28, 1929.

Miata? 5 eric.

i" Vdi i PETER S. IVANHOFF, OF LOS ANGELES, CALFORNA, ASSIGNOR T WILLIAMB.

BASTIAN, TRUSTEE, OF LOS ANGELES, CALIFORNIA.

QUICK-THROW MECHANISM.

Application filed June 22,

My invention relates to quick-throw mechanisms and has for an object theprovision of a novel mechanism of this type.

Quick-throw mechanisms are requiredl incubatore, electric stoves andappliances,

etc.

In quick-throw mechanisms previously produced it has been difficult toadiust the mechanism so as to accurately determine the point in themovement of the prime mover at which the quick lmovement of the controlmember would be caused. lt is a further object of my invention toprovide a quick-throw mechanism in which this adjustment may be readilyand accurately made.

In many of the quick-throw mechanisms in use at present gravity isdepended upon to perform one or more ot the functions of the device sothat it is necessary that it be disposed in a given position in order towork properly.

It is a still further object of my invention manifest in the followingldescription and in the accompanying drawings, in which Fig. 1 is adiagrammatic view illustrating a thermostatic quick-throw gas valveincorporated in a hot water tank and embodying a preferred form of myinvention.

Fig. 2 is an enlarged vertical section al'view taken on the line 2-2 otFig.I 1, and illustra-ting in detail the thermostatic quick-throw valveshown in Fig. 1. y

Fig. 3 is a fragmentary' view similar to Fig. 2 illustrating` the partsof the quickthrow mechanism in diderent positions.

1927. Serial No. 200,572.

F ig. 4 is a vertical sectional view the line 4-4 of Fig. 2.

Fig. 5 is a horizontal sectional View taken on the line 5-5 of Fig. 2

Referring specifically to the drawings, Fig. 1 shows a boiler tank 1()having `a water chamber 11 and a heating retort 12 connected to vtheupper and lower ends of the chamber 11 by pipes'l and 14. A gas burner15 is disposed about the pipe 14 below the lretort 12 and bv heating theretort heats the water taken on in the chamber 11. Y

.A thermostaticallv controlled quick-throw gas valve is screwed into alower wall 21 of the tank 10 so that a thermostatie element 22 of thevalve 20 entends upward into the waterin the'chamber 11. rI he gas valve20 has a vertical tubular body 25, the upper end of which is providedwith externall threads 26 which are adapted to screw into ya suitableopening in the tank wall 21., and

internal threads 27 which are adapted to threadedly receive the lowerend of a copper tube 28 of the thermostat 22.

1 The upper end of the tube 28 is closed by a vplug 29 which carriesarod 80 extending downward through the tube 28 intothe tubularbody 25.The rod 3() has a point-'ed lower end 3l which engages with a' cammember 32 which comprises a bell crank 33 pivoted at 34 upon the body 25and extends downward from the lower mouth ot the body where it isprovided with a head 36 having a peak'- shaped cam surface 37. Theengagement of .the lower end 31 of the thermostat rodBO with the cammember 32 iso center relativev to the pivot 34 so that downward movementof thethermostat rod causes the cam member 32 to swing' toward theright. A spring-38 connects the lower end of the Abell crank 33 to aside wall 39 of na quick-throw mechanism 2. The housing` 40 has a backwall 41 which cooperates with the side walls 39 to provide a gas chamber42, access to which is had by removal of a cover plate 43 which isnormally connected to suitable flanges provided on the side walls 39 bymachine screws 44. Extending` outward from the lett-hand side wall' 39 fis a nipple 48 which is provided with internalf kthe chamber 42 which(is, foraminated to housing 4Q. which is provided upon the lower vend ofthe body 25, as clearly shown in Fig.

provide a gas passage 53 extending through the shell 49. A valve seat 55is formed in the outer mouth of the passage 53. A valve stem 58 passescentrally through the spider 52 so as to be axially guided thereby. Avalve head 59, here comprising a ball, is mounted on the outer end ofthe stem 58 and is adapted to be seated upon the seat 55 or raisedtherefrom by the sliding of the stem 58 in the spider 52. A pin 62 isprovided in the inner end of the stem 58 and a spring 63 iscornpressedbetween the spider 52 and the pin 62 to hold the valve head59 against the seat 55. v Y f An Velbow 65 connects with a gas supplypipe 66 and is threadedly secured in the outer end of the nipple 48 tofurnish a supply of gas to the gas valve 50. Y When the cover plate 43is in place the gas chamber 42 is a closed chamber from which gas maypass only by an opening 68 in the Vwall 41 which connects with a burnersupply pipe 69 which leads to the gas burner 15. The housingwall 41 hasa boss 7 0 which eX- tends inwardintothe chamber 42 directly below theconnection o f the body 25 with the housing`40. The boss 70 is provid-edwith a cylindrical recess 71 in which a rocking pin 72 is rotatablyreceived. The rocking pin 72 has a transverse hole 73 formed thereinthrough which projects a stem 75 of a secondary cam member 76. The cammember 76 has ya forked head 77' mounted upon the upper end of the stem75, the two arm's of the fork being perforated at opposite points torotatablyreceive a rocking pin 78and a roller supporting pin 79, theroller supporting pin being disposed above the rocking pin 78. Therocking pin 7.8 is provided with a transverse internally threaded holefor a purpose to be described later. The roller pin 79 supports a camfollower roller which is'adapted to contact'the peak-shaped camsurface37 of the primary cam member 32. A compression Yspring 86 is disposedabout the stem 75 between the head 77 `and the rocking pin 72,

j this spring tending to urge the secondary cam member 76 upward towardsthe primary cam member 32. j. A control rod 90, as clearly shown in Fig.2, is threaded at one end and is adapted to be screwed into and throughthe threaded transverse hole formed in the rocking pin 78. After havingbeen threaded through this hole the projecting end of the rod 90 has abutton 93 rigidly mounted thereon, the outer face of the button 93 beingnormally Vdisposed in contact with'the righthand end of the valve stem58. The opposite end of the rod from the button 93thereof has a ball 94rigidly mounted thereon, the ball 94 being provided with a transverselyprojectingpin 9.5. Y Y l A control rod actuating mechanism 98 isymounted in one of the walls 39 substantially in alignment with and onthe opposite side of the gas chamber 42 from-the gas inlet valve 50. Thecontrol mechanism 98 includes a cylindrical shell 100 internallythreaded at its mouth and slotted longitudinally on opposite sides, theshell being of such size as to receive the ball 94, the opposite ends ofthe pin projecting into said slots. An eXterf 94 and the rod 90. Thehead 106 has a stemV 107 which projects outthrough a hole in a boss 109provided in one of the walls 39, as

clearly shownk in Fig. 2. A manually operable wheel 112 is mounted onthe outer end of the stem 107. A compression spring 113 disposed betweenthe boss 109 and the wheel 112 stillly urges the stem 107 outward .so asto draw the shell head 106 into compressing relation with a packingwasher 114 which is disposed about the steni107 adjacent to the head106. The packing washer 114 thus forms a tight seal between the shellhead 106 and the boss 109 and permits the shell 100 to be easily rotatedby the wheel 112. The outer surface 118 of the button 93 may have aspherical form generated about the center of the ball 94 for apurpose'which will be made clear in the description of the operation.

The operation of my quick-throw mechanism as embodied in thethern'iostatic quiclithrow valve 20 vis as follows:

' Aspreviouslystated, theball r94 has a certain freedom to move to theright or left in the shell 100. f Thispermits the rod 90 and thesecondary cam member 76 to have a similar freedom. Urged by thespring86, however, the secondary cam: member 76is constantly forced upward sothat theroller 85 kcaigages the peak-shaped cam surface 37V of theprimary cam member- .32. It depends upon which slope of the surface 37is 'engaged bythe roller 85 as to whether the secondary cam member 76and the rod 90 are disposed at the right-hand or at the left-hand end ofthe path which they are free to move upon by virtue of the play of theball 94 in the shell 100. As previously mentioned, the primary cammember 32 has the form of a bell crank 33 which .is swung tothe right asthe lower end 31 of the thermostat rod 30 moves downward. This lattermotion occurs as the water in the tank chamber 11 cools off. F ig. 2shows the parts of themechanism positioned as they would be when thewater in the tank chamber 11- is between its minimum and maX- lirnurntemperatures and with the secondary llO cam member 7G and the rod 90 inright-hand position so as to permit the spring 63 to close the valve 50and shut oil the supply of gas through the hole 68 to the gas burner 15.rl"hus it is clear that with the gas burner shut oft', the water in thetank chamber 11 will be gradually cooling off due to radiation and t useof the water from the service outlets.

As the water cools the lower end 31 of the rod moves down swinging theprimary cam member 32 to the right against the tension of the spring 88until the roller 85 passes overthe peak of the cam surface 37. As thisoccurs the compression spring 86 is released to force the secondary cammember 76V upward, the engagement of the'roller 85 with the oppositeslope of the cam surface 37 at this time causing the secondary cammember 76 and the rod 90 to be thrown to the left with a quick movementinto the position in which these part-s are shown in Fig. 3. In thismovement the button 93 engages the end of the valve stem 58 so as toopen the valve 50 to permit gas to pass therethrough into the gaschamber 42 and thence by way of the opening 68 and the pipe 69 to thegas burner 15, this gas being ignited by a suitable pilot light which isconstantly burning adjacent to the burner 15.

As the flame from the burner 15 heats the water in the retort 12 and inthe tank chamber 11 and its temperature rises to the desired maximum,the lower end 31 of the rod 8O is drawn upward so as to relieve the bellcrank 33 fromits pressure and to permit the spring 38 to swing this bellcrank to the left so that the peak of the cam surface 37 will again bepassed over by the roller 85, but in the opposite direction from thatpreviously described for the opening of the valve 50. As

the roller 85 passes over the peak of the cam surface 87, the secondarycani member 7 6 and the rod 90 snap from their left position to theirright position and the pressure of the button 93 against the valve stein58-is relieved, permit-ting the spring 63 to close the valve and stopthe liow of gasto the burner y 15.V

rEhenumber of degrees of temperature between minimum and maximumtemperatures is a function of the fixed proportions of the mechanism andis therefore consequently a constant quantity. Y

The absolute values of maximum and minimum temperatures, or those atwhich the valve 50 is closed or opened respectively, are

might be made without departing from the spirit of the invention or thescope of the appended claims. For example, it might be immaterialwhether or not the cam surface 87 was provided upon the primary cammember 32 or upon the secondary-cam member 7 6 so long as the rollerfollower 85l was provided upon the other ofthese two members. thereforedesire to belimited only by the liberal interpretation of the appendedclaims.

If it is found desirable, stops 125 comprising pairs of nuts screwedupon the threaded end of the rod 90 may be disposed on oppositev sidesof the rocking pin 78 so as to limit the adjustment of the rod 90relative to the pin 78. As each of t-lie stops would be formed by twonuts threaded on the rod 90, each of the stops could be given a fixedadjusted position by bringing the nuts which comprise it into pressuralcontact with each other. These stops would necessarily be of such anoutside diameter as to permit them topass between the arms ofthe forkedhead 77 so as to come in contact with -the rocking pin 78 and thus limitthe longitudinal adjustment of the rod- 9() relative to therocking pin78 ina given direction. ln case stops, as above described, were usedupon the rod 90 longitudinal movement of the rocking pin 78 in theforked head 77 would be prevented by any suitable means provided in theconstruction of the secondary cam member 76. Thus the rod 90'would atall times be disposed. equidistant from the two arms of the forked head77. A

ltis to be understood that while a hand wheel `112 is shown for therotation of the rod 90, any suitable mechanism may be employed for thispurpose and that indicia may be pro-- vided upon this rod rotating meansand the housing shell 4l() so as to indicate the temperature at whichthe quick-throw mechanism will operate for a given position of this rodrotating means.

l claim as my invention: ,F

1. ln a quick-throw mechanism, the com'- bination of: a primary cammember-adapted tov move relatively slowly, a substantial coniiio ponentof said slow movement being in a givn en direction; a quick-throwmemberadapted to move quickly, a substantial component of saidv quick movementbeing in a direction parallel to said component of said slow movement;means for limiting said quick movevment of said quick-throw member; asecondary cam member associated withsaid quickrthrow member so as topartake of said limited quickmovement thereof; means for yieldablyurging said secondary cam member against said primary cam member in adirec- Y tion transverse to said direction of movement of said primarycam member, one of said cam members having a peak-shaped cam surfaceover vwhich the other cam member rides, the passage of said other`cammember ,over the crest ofsaid peak causing vsaid quick movementofsaid secondary cam member and said quick throw member, saidquick-throw member having a screw-thread engagement with said secondarycam member; and means for rotating said quick-throw member to vary thecooperative relationship of said cam members and thus vary the time ofthe quickthrow movement relative to the movement of the primary cammember.

2. In a quick-throw mechanism, the combination of: a primary cam memberadapted to move relatively slowly, a substantial component of said slowmovement being in a given direction; a quick-throw member adapted tomove quickly, a substantial component of said quick movement being inadirection parallel to said component of said slow movement; `means forlimiting said quick movement of said quick-throw member; a secondary cammember associated with said quick-throw member so as to partake of saidlimited quick movement thereof; means for yieldably urging saidsecondary cam member against said primary cam member in a directiontransverse to said direction of movementy of said primary cam member,one of said cam membershaving a peak-shaped cam surface over which theother 'cam member rides, the passage of said other cam member over thecrest of said peak causing said quick movement of said secondary cammember and said quick-tlirowmember; and means for adjusting the positionof said secondary cam member relative to said quick-throw member todeterminev at which position of said primary cam member that said rapidmovement takes place.

3. In a quick-throw mechanism, the combination of: a primary cam memberadapted to move relatively slowly, a substantial-component of said slowmovementbeing in a giv-.

en direction; a secondary cam vmembei' adapted to move quickly, asubstantial component of said quick movement being in a directionparallel to said component of said slow movement; means yieldably urgingsaid secondary cam member toward said primary cam member ina directiontransverse to the direction of said component of said slow movement;means for limiting said quick movement of said secondary cam member,there being cam surfaces-on said cam membersY which cooperate duringsaid slow movement to move said secondary cam member a given distance insaid transverse direction against said yieldable means away from saidprimary cam member, said caml surfaces discngaging at said distance, topermit said secondary cani member to be moved quickly towards saidprimary cam `member by said yieldable means, said movement resulting inthe aforesaid quick movement of saidsecondary cam member, and 'rotaryadjusting means for varying the `cooperative relationship of said cammembers and thus varyY the time er' the quick movement of the secondarycam member relative to the slow movement of the primary cam member.

4; In a quick-throw mechanism, the combination of: a frame; a primarycam member mounted on said frame and capable of relatively slow movementin a given direction; a secondary cam member mounted on said frame formovement in a direction substantially parallel to that of said primarycam member; yieldable means for urging said secondary cam member againstsaid primary cam member,sthere being cam surfaces on said cam memberswhichV cause said slow movement of said primary cam member to force saidsecondary cam member a given distance in a direction transverse relativeto said slow movement, said surfaces then disengaging to permit saidsecondary cam member to respond to said yieldable means in a quickmovement; and means for varying the cooperative relationship of theprimary and secondaiy cam members.

5. In a quick-throw mechanism, the combination of: a primary `cam membercapable of relatively slowv movement; a secondary cam member movable'relative to said primary cammember; a cam follower provided on one ofsaid members, there being aV peak like cam surface provided on the othermember; means for urging said secondary cam member toward said primarycam member so that said follower rests upon a slope of said peak likecam surface so that said secondary cam member is urged laterally; meansfor Vlimiting lateral movement of said secondary with; and means forrotating said actuating member tovary the cooperative relationship ofsaid cam members andl thus determine at what point in the travel of theprimary cam.

member the quick movement of the secondary cam member and actuatingmember will take place. f

6. A combination as in claimt in which said limiting means is adjustableto determine A where in said movement of said primary cam member thatsaid follower rides over the crest of said Vcam surface.

v7. In a quick-throw mechanism, thev combination of: a frame; a primarycam member mounted on said frame and capable of relatively slow movementin a givengdirectien' frame for movement in a direction substantiallyparallel to that of said primary cam member; yieldable means for urgingsaid secondary cam member against said primary cam member, there beingcam surfaces on said cam members which cause said slow movement of saidprimary cam member to force said secondary cam member a given distancein a direction transverse relative to said slovv movement, said surfacesthen disengaging to permit said secondary cam member to respond to saidyieldable means in a quiclr movement; a rotatable actuating rod having ascrew-thread engagement with said secondary cam member; a housingenclosing the above-named mechanism; and means associated with said rodand extending through said housing, said last-named means being operablefrom the exterior to rotate said rod and vary the cooperativerelationship of they tWo cam members.

In testimony whereof, I have hereunto setl myhand. atLos Angeles,California, this 11th day of June, 1927.

PETER s. ivANHorF.V

